My time!!

I wish it was my time already. I have a good job I pay all my bills I've graduated from 2 technical schools and plan to go back to school soon. My older brother has 2 kids and my sister under me has a kid. They live at home with mom and I'm out on my own. I've been in a committed relationship for 3 years and I feel I'm ready to have a baby. I don't know what I'm doing wrong.